FROZEN PHASES OF RANDOM HETEROPOLYMERS IN DISORDERED MEDIA

We consider the behavior of random heteropolymers (RHP's) in random me dia via Monte Carlo simulations. When the bare heteropolymer prefers u nlike segments to be adjacent to each other, the disordered medium ind uces rather unusual behavior. As temperature is scanned, we find two f rozen phases with different ''folding'' patterns separated by a reentr ant phase. The phenomena revealed by our results are elucidated on phy sical grounds, experimental tests are suggested, and the agreement bet ween the simulation results and a simple analytical calculation is dis cussed.